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Waingawa River at South Road

The Waingawa River at South Road site is located in the lower reaches of the Waingawa River, just south of Masterton, and is publicly accessible from South Road.

The site is monitored as a part of two separate programmes; the Recreational Water Quality Programme, which informs the public about the suitability of sites for recreational activities (see the 'Can I Swim Here' module), as well as the Rivers Environmental Monitoring programme, which is designed to measure the environmental health of rivers and streams (see the 'River Quality' module).

The safety of water for swimming is determined by measuring ‘faecal indicator bacteria’ (E. coli) which indicates the likely levels of pathogens in the water. Monitoring is conducted on a weekly basis over the summer months (December to March).

Monitoring the different variables that affect water quality is carried out monthly. This involves the assessment of water clarity, nitrogen and phosphorus concentration, dissolved oxygen, pH and the concentration of the bacteria Escherichia coli (E. coli). The Macroinvertebrate Community Index (MCI) classifies the site based on the number of and different types of macroinvertebrates living at the site and is measured annually.

Water quality and macroinvertebrate health at this site is generally good, and it is generally safe to swim here during dry weather. This is a reflection of the surrounding land cover (which is predominantly indigenous forest) and the fact that it is hard-bottomed (made up of cobbles and gravel).  However, the site can be affected by faecal contamination from run-off following heavy or prolonged rainfall. We advise people not to swim for at least two days after heavy rain.

For the latest recreational water quality information, please go to the GWRC website, or check out the latest recreational water quality reports. For more information on Greater Wellington Regional Council's environmental monitoring programmes, check out the latest water quality reports

Water Quality
Water quality data for this site

This dashboard shows information on the data collected by the regional councils for water quality indicators, analysed as state and trend.

  • State

    State shows how the median of samples from this site compares to other sites.

    This site is a {{siteDescription}} site. Currently showing the state of this site compared to:

  • The state is also represented by comparison to the National Objectives Framework (NOF) in the National Policy Statement for Freshwater Management 2020  for some indicators.

  • Trend

    Trend shows how the quality of water is changing over time. Depending on the sampling history duration, five, ten and fifteen year timescales are available:

The state is also represented by comparison to the National Objectives Framework (NOF) in the National Policy Statement for Freshwater Management 2020  for some indicators.


Can I trust this data?

The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for data collection, laboratory analysis of samples collected and the statistical analysis and interpretation of the results presented.

If all Cawthron ticks are green, then you can trust this data. However, if one or more ticks are orange, then conclusions should be treated with some caution.

For more details on each tick, see our 'Can I Trust This Data?' Factsheet.

Can I trust the data for this site?
Data Collection

All samples were collected using approved field protocols and have been analysed in accredited laboratories. Therefore the data shown here has been collected and analysed following best practice.

State

All samples were collected using approved field protocols and have been analysed in accredited laboratories.

Trend - SAMPLING FREQUENCY

The majority of trend calculations for this council are based on monthly data. Sites with more data points generally have greater ‘statistical power’ for trends to be detected. Therefore, any trends shown here are based on best practice in terms of sampling frequency based on Davies-Colley et al. (2012).

Bacteria

E. coli
{{medianValue('ECOLI')}}
State
{{stateMsg(ECOLI.StateScore)}}
State
{{ECOLI.NofBand | uppercase}}
NOF Band
N/A
NOF Band
Trend
{{trendMsg(ECOLI)}}

Sample history at this site

Showing:
E. coli samples for Waingawa River at South Road
n/100ml

What is this graph showing me?

This graph is displaying E. coli concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

What do the NOF icons mean?

The bands for E. coli are as outlined in the NOF for freshwater:

A
For at least half the time, the estimated risk is <1 in 1000 (0.1% risk). The predicted average infection risk is 1%*.
B
For at least half the time, the estimated risk is <1 in 1000 (0.1% risk). The predicted average infection risk is 2%*.
C
For at least half the time, the estimated risk is <1 in 1000 (0.1% risk). The predicted average infection risk is 3%*.
D
20-30% of the time, the estimated risk is >=50 in 1000 (>5% risk). The predicted average infection risk is >3%*.
E
For more than 30% of the time, the estimated risk is >=50 in 1000 (>5% risk). The predicted average infection risk is >7%*.
* The predicted average infection risk is the overall average infection to swimmers based on a random exposure on a random day, ignoring any possibility of not swimming during high flows or when a surveillance advisory is in place (assuming that the E. coli concentration follows a lognormal distribution). Actual risk will generally be less if a person does not swim during high flows.

Clarity

Black disc
{{medianValue('BDISC')}}
State
{{stateMsg(BDISC.StateScore)}}
Trend
{{trendMsg(BDISC)}}

Sample history at this site

Showing:
Black Disc samples for Waingawa River at South Road
metres

What is this graph showing me?

This graph is displaying Black Disc readings over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

Turbidity
{{medianValue('TURB')}}
State
{{stateMsg(TURB.StateScore)}}
Trend
{{trendMsg(TURB)}}

Sample history at this site

Showing:
Turbidity samples for Waingawa River at South Road
NTU
FNU

What is this graph showing me?

This graph is displaying Turbidity levels over the selected time period. You can adjust this period by changing the dropdowns. 

Yellow coloured bars on the graph represent turbidity values measured in NTU. These records form the basis for the state and trend indicators displayed on the dashboard. Some councils now also measure turbidity in FNU.  These data are shown as blue coloured bars and are not used by LAWA for the state and trend indicators.

Find out about how State and Trend are calculated.

Nitrogen

Total Nitrogen
{{medianValue('TN')}}
State
{{stateMsg(TN.StateScore)}}
Trend
{{trendMsg(TN)}}

Sample history at this site

Showing:
Total Nitrogen samples for Waingawa River at South Road
g/m3

What is this graph showing me?

This graph is displaying Total Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

Total Oxidised Nitrogen
{{medianValue('TON')}}
State
{{stateMsg(TON.StateScore)}}
Trend
{{trendMsg(TON)}}

Sample history at this site

Showing:
Total Oxidised Nitrogen samples for Waingawa River at South Road
g/m3

What is this graph showing me?

This graph is displaying Total Oxidised Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

Ammoniacal Nitrogen
{{medianValue('NH4')}}
State
{{stateMsg(NH4.StateScore)}}
State
{{NH4.NofBand | uppercase}}
NOF Band
N/A
NOF Band
Trend
{{trendMsg(NH4)}}

Sample history at this site

Showing:
Ammoniacal Nitrogen samples for Waingawa River at South Road
g/m3

What is this graph showing me?

This graph is displaying Ammoniacal Nitrogen concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

What do the NOF icons mean?

The bands for Ammoniacal Nitrogen are as outlined in the NOF for freshwater:

A
99% species protection level: No observed effect on any species tested.
B
95% species protection level: Starts impacting occasionally on the 5% most sensitive species.
National bottom line: Annual median 0.24 mg NH4-N/L. Annual maximum 0.40 mg NH4-N/L (milligrams ammoniacal-nitrogen per litre). Note 1 mg/l = 1 g/m3
C
80% species protection level: Starts impacting regularly on the 20% most sensitive species (reduced survival of most sensitive species).
D
Starts approaching acute impact level (ie risk of death) for sensitive species.

Phosphorus

Dissolved Reactive Phosphorus
{{medianValue('DRP')}}
State
{{stateMsg(DRP.StateScore)}}
State
{{DRP.NofBand | uppercase}}
NOF Band
N/A
NOF Band
Trend
{{trendMsg(DRP)}}

Sample history at this site

Showing:
Dissolved Reactive Phosphorus samples for Waingawa River at South Road
g/m3

What is this graph showing me?

This graph is displaying Dissolved Reactive Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

What do the NOF icons mean?

The bands for Dissolved Reactive Phosphorus are as outlined in the NOF for freshwater:

A
Ecological communities and ecosystem processes are similar to those of natural reference conditions. No adverse effects attributable to dissolved reactive phosphorus (DRP) enrichment are expected.
B
Ecological communities are slightly impacted by minor DRP elevation above natural reference conditions. If other conditions also favour eutrophication, sensitive ecosystems may experience additional algal and plant growth, loss of sensitive macroinvertebrate taxa, and higher respiration and decay rates.
C
Ecological communities are impacted by moderate DRP elevation above natural reference conditions. If other conditions also favour eutrophication, DRP enrichment may cause increased algal and plant growth, loss of sensitive macroinvertebrate and fish taxa, and high rates of respiration and decay.
D
Ecological communities impacted by substantial DRP elevation above natural reference conditions. In combination with other conditions favouring eutrophication, DRP enrichment drives excessive primary production and significant changes in macroinvertebrate and fish communities, as taxa sensitive to hypoxia are lost.
Total Phosphorus
{{medianValue('TP')}}
State
{{stateMsg(TP.StateScore)}}
Trend
{{trendMsg(TP)}}

Sample history at this site

Showing:
Total Phosphorus samples for Waingawa River at South Road
g/m3

What is this graph showing me?

This graph is displaying Total Phosphorus concentrations over the selected time period. You can adjust this period by changing the dropdowns. These records form the basis for the state and trend indicators displayed on the dashboard. 

Find out about how State and Trend are calculated.

Can I Swim Here?
Ecology
Ecological data for this site

This dashboard shows the results from macroinvertebrate sampling at this site.  It displays three ecological indicators: macroinvertebrate community index, taxonomic richness and percent EPT. 

For sites where State is 'N/A' or Trend is 'Not Assessed', there are not enough data to calculate a State and/or Trend result.  Click on an indicator to see the available historical data.

 

Select trend period for MCI

  • 10 years
  • 15 years
  • MCI

    5-year median: {{medians.MciMedian}}

    State

    {{medians.MciState.Text | uppercase}}

    Trend
    {{medians.MciTrend[selectedTrendPeriod].Text}}
    The Macroinvertebrate Community Index uses aquatic macroinvertebrates to assess the health of streams in New Zealand.

    MCI sample history at this site

    Showing:
    MCI for Waingawa River at South Road
    MCI score

    What do the NOF icons mean?

    A
    Macroinvertebrate community indicative of pristine conditions with almost no organic pollution or nutrient enrichment.
    B
    Macroinvertebrate community indicative of mild organic pollution or nutrient enrichment. Largely composed of taxa sensitive to organic pollution/nutrient enrichment.
    C
    Macroinvertebrate community indicative of moderate organic pollution or nutrient enrichment. There is a mix of taxa sensitive and insensitive to organic pollution/nutrient enrichment.
    National bottom line: MCI score 90
    D
    Macroinvertebrate community indicative of severe organic pollution or nutrient enrichment. Communities are largely composed of taxa insensitive to inorganic pollution/nutrient enrichment.
  • Taxonomic richness

    The median of the last 5 years of data

    {{medians.TaxaMedian || 'N/A'}}
    Taxonomic richness is the number of different taxa present in an ecological community identified to the best possible level.

    Taxa richness history at this site

    Showing:
    Taxa richness for Waingawa River at South Road
    Number of taxa
  • Percent EPT richness

    The median of the last 5 years of data

    {{medians.EptMedian}}
    EPT are macroinvertebrates that are sensitive to water pollution. These are Ephemeroptera (mayfly), Plecoptera (stonefly) and Trichoptera (caddisfly).

    EPT history at this site

    Showing:
    Percent EPT richness for Waingawa River at South Road
    EPT %
Can I trust this data?

The Cawthron Institute has worked alongside regional councils to verify the processes and methods used for macroinvertebrate data collection, processing of the data in the laboratory, quality control in the field and laboratory and the statistical analysis and interpretation of the results presented.

For more details on each tick, see our 'Can I Trust this Data?' Factsheet.

Can I trust the data for this site?
Data Collection

Macroinvertebrates are sampled at this site as part of council's stream health monitoring programme.

Sampling - Frequency

Macroinvertebrate sampling is done annually or more frequently at this site.  Annual sampling provides enough data points for state and trend analyses to be calculated with sufficient statistical power for trend detection.

Sampling - Protocols

This site is a hard-bottomed site and appropriate sampling protocols have been applied.  Data shown here have been collected using current best-practice based on Stark et al. (2001).

Sampling - Habitat

Macroinvertebrate sampling is done in riffle habitat at this site. Data shown here are therefore following best practice as described in Stark et al. (2001).

Sampling - Stand-down period

This council does not collect any macroinvertebrate samples for up to two weeks after a flood greater than three times the median flow as recommended by Stark et al. (2001). Therefore, data collected at this site is following best practice.

Processing - Protocol

Samples at this site have been processed following sampling protocols P2 or P3 and data have been processed following best practice as described by Stark et al. (2001).

Quality Control - Field

Field data collected at this site had no quality control applied to it.

Quality Control - Lab

Data processed at this site has had one of the three Laboratory Quality Control Protocols (i.e., QC1, QC2,Q C3) applied. Data shown here is more robust than data with no laboratory QC applied.